Failing to update central index

Today after updating the central index I noticed some error messages in the console:
9/10/08 4:37:24 PM EEST: Error on adding indexing context central; /home/joonas/workspace/.metadata/.plugins/org.maven.ide.eclipse/nexus/central/_9.fdt (No such file or directory)

I tried uninstalling the central index feature, removing the org.maven.ide.eclipse/nexus/central directory (which resulted redownloading the index, then the same issue again).

No idea how to fix this; no errors are reported while downloading the index (http://repo1.maven.org/maven2/.index/nexus-maven-repository-index.zip).. Could the index file be broken? Long exception trace was outputted to console running eclipse:

Exception in thread "Thread-6" org.apache.lucene.index.MergePolicy$MergeException: java.io.FileNotFoundException: /home/joonas/workspace/.metadata/.plugins/org.maven.ide.eclipse/nexus/central/_9.fdt (No such file or directory)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:271)
Caused by: java.io.FileNotFoundException: /home/joonas/workspace/.metadata/.plugins/org.maven.ide.eclipse/nexus/central/_9.fdt (No such file or directory)
at java.io.RandomAccessFile.open(Native Method)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
at org.apache.lucene.store.FSDirectory$FSIndexInput$Descriptor.<init>(FSDirectory.java:506)
at org.apache.lucene.store.FSDirectory$FSIndexInput.<init>(FSDirectory.java:536)
at org.apache.lucene.store.FSDirectory.openInput(FSDirectory.java:445)
at org.apache.lucene.index.FieldsReader.<init>(FieldsReader.java:75)
at org.apache.lucene.index.SegmentReader.initialize(SegmentReader.java:308)
at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:262)
at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:221)
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3099)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:2834)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:240)